"Eairh" means Baby is gassy and needs relief. It can also sound like "eeerrrhhh" or "air." You'll recognize a lower and more urgent sound when the muscles around Baby's abdomen constrict. If you haven't been burping Baby at the "eh," you will soon hear "eairh."
When Baby is experiencing discomfort, you will hear a breathy "heh" sound. Sometimes, this will be a repetitious "heh-heh-heh" or "ha-ha-ha-ha." Now, you must assess what's making Baby uncomfortable. Is she hot? Cold? Need a diaper change?
Having trouble? Try to discern what Baby needs before he dissolves into sobs or change Baby's position. And if you hear more than one "word," act on the one that is most dominant or frequent. For more info, check out the Dunstan Baby Language DVDs.